1.

    A highly impure sample of benzoic acid is contaminated with naphthalene. Which of the following techniques would be LEAST effective for purifying the benzoic acid?

    A

    Simple distillation

    B

    Sublimation followed by recrystallization

    C

    Recrystallization from hot water

    D

    Treatment with sodium bicarbonate followed by acidification

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    🎓 Ncert Level:Application
    🎯Difficulty :Hard
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Purification techniques, sublimation, recrystallization, distillation, acid-base properties

    Related Questions

    1.

    The best method to separate the mixture of ortho−ortho - and −para - para nitrophenol (1:1) is

    A

    Vaporisation

    B

    Colour spectrum

    C

    Distillation

    D

    Crystallisation

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    🎓 Ncert Level:Application
    🎯Difficulty :Easy
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Separation techniques, boiling point, intermolecular forces, isomerism

    2.

    Impure glycerine can be purified by

    A

    Steam distillation

    B

    Simple distillation

    C

    Vaccum distillation

    D

    Extraction with a solvent

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    🎓 Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :separation techniques, boiling point, vapor pressure

    3.

    Which purification technique is MOST suitable for separating a thermally unstable liquid organic compound from a non-volatile impurity?

    A

    Simple distillation

    B

    Fractional distillation

    C

    Steam distillation

    D

    Vacuum distillation

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    🎓 Ncert Level:Application
    🎯Difficulty :Hard
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Distillation, boiling point, vacuum distillation, purification techniques

    4.

    Aniline is separated by:

    A

    Fractional crystallisation

    B

    Fractional distillation

    C

    Steam distillation

    D

    Vacuum distillation

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    🎓 Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Separation techniques, Boiling point, Steam distillation

    5.

    A mixture of benzene and CHCl3CHC{l_3} is separated by

    A

    Sublimation

    B

    Separating funnel

    C

    Crystallisation

    D

    Distillation

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    🎓 Ncert Level:Application
    🎯Difficulty :Easy
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :separation techniques, boiling point, intermolecular forces

    6.

    A liquid decomposes at its normal boiling point. It can be purified by

    A

    Sublimation

    B

    Steam distillation

    C

    Vacuum distillation

    D

    Fractional distillation

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    🎓 Ncert Level:Application
    🎯Difficulty :Easy
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :boiling point, decomposition, purification techniques, vacuum distillation

    7.

    A student attempts to purify a mixture of aniline and nitrobenzene by steam distillation. Which compound will distill over first, and why?

    A

    Nitrobenzene, due to its higher molecular weight

    B

    Aniline, due to its lower boiling point and formation of less extensive hydrogen bonds with water compared to nitrobenzene

    C

    Both will distill over simultaneously as they form an azeotropic mixture

    D

    Nitrobenzene, because it is less volatile than aniline

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    🎓 Ncert Level:Analyzing
    🎯Difficulty :Hard
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Steam distillation, intermolecular forces, boiling point, aniline, nitrobenzene

    8.

    Some organic compounds are purified by distillation at low pressure because the compounds are

    A

    unstable at high temperatures

    B

    volatile at high temperatures

    C

    insoluble in water

    D

    stable at high temperatures

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    🎓 Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :distillation, vapor pressure, boiling point, thermal decomposition

    9.

    Steam distillation is based on the fact that vaporisation of organic liquid takes place at

    A

    Lower temperature than its boiling point

    B

    Higher temperature than its boiling point

    C

    Its boiling point

    D

    Water and organic liquid both undergo distillation

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    🎓 Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :steam distillation, vapor pressure, boiling point

    10.

    The best method to separate the mixture of ortho−ortho - and −para - para nitrophenol (1:1) is

    A

    Vaporisation

    B

    Colour spectrum

    C

    Distillation

    D

    Crystallisation

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:Organic Chemistry: Some basic principles and techniques
    🎯Topic:Purification Of Organic Compounds
    🎓 Ncert Level:Application
    🎯Difficulty :Easy
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Separation techniques, Physical properties, Intermolecular forces, Boiling point

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